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The embryonic stage extends from 16 days through the end of week 8.

A.

false

B.

true

Answer and Explanation

The Correct Answer is A

The embryonic stage extends from 16 days through the end of week 8.


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Related Questions

Correct Answer is D

Explanation

A. Ca2+: prevents the entrance of any more sperm- While calcium ions play a role in the slow block to polyspermy, the fast block involves sodium ions.

B. Na+: prevents the entrance of more Na- The fast block to polyspermy involves sodium ions (Na+), but the depolarization of the egg membrane prevents the entrance of more sperm, not just more Na+.

C. Na+: prevents the entrance of Ca2+. The fast block prevents additional sperm from entering, not calcium ions.

D. Na+: prevents the entrance of any more sperm: The fast block to polyspermy involves the opening of sodium ion channels, leading to depolarization of the egg membrane. This depolarization prevents other sperm from binding to and penetrating the egg.

Correct Answer is ["A"]

Explanation

A. The cardiovascular system is primarily involved in transporting blood and nutrients but does not directly excrete waste.

B. The respiratory system: The respiratory system helps excrete carbon dioxide, a waste product of metabolism.

C. The digestive system excretes waste through the process of defecation.

D. The integumentary system (skin) excretes waste through sweat.

E. The urinary system is directly involved in the excretion of waste products through urine.

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